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Hi Donbryce
you are right that the level does increase slowly as the transmission oil drains back into the pan from the components of the transmission and cooler when the engine is off. when you start the engine the levels drops to the lowest point it will be on the dipstick and some cars have a cold transmission oil level mark on one side and hot on the other. the hot is higher as the oil expands slightly as it gets hot so the level goes up again by about an inch from the cold side.
you should really only take a fluid measurement after about 20 miles of driving with the car in either park or neutral
cheers
Barri
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